*{margin: 0px;padding: 0px;}
.head_title{
    width: 60px;
    height: 60px;
}
.dropdown{
    float: right;
}
nav{
    margin-bottom: 0px;
}
.carousel-inner img{margin:0 auto;}
#body_book_left{
    width: 50%;
    height: auto;
    float: left;
}
#body_book_right{
    width: 50%;
    height: auto;
    float: right;
}
#carousel-example-generic {
    margin-bottom: 10px;
}